(a) Purpose. The (IH) Industrial Heavy District is intended to provide for a full range of industrial uses, including activities which may constitute substantial environmental influences or hazards by their operation and/or appearance. (b) Permitted Uses. Permitted uses in the IH District shall be those uses specified as Permitted Uses and Special Exception Uses in the IM District, except no residential use shall be allowed. Explore Fairfield County. As the fourth-fastest-growing county in Ohio over the past decade, Fairfield County supports more than 3,000 businesses and a population of more than 160,000 people. With a wide range of community surroundings, both metropolitan and rural, the county is a major manufacturing and agricultural hub.